From Tom Mattei and EM magazine:
Due Diligence for Documentation Provided by Stack Testers Relative to 40 CFR, Part 75-Affected Sources

http://lnkd.in/EhpwmG

More Reasons Not To Store Dust In Your Dust Collector Hopper

Guest Post from Dominick DalSanto of Baghouse.com 

Clogged machinery,  exposure to hazardous chemicals, and disruptions in plant processes,  are just a few of the problems that come from using your dust collector hopper for dust storage.

Article Link:
http://www.baghouse.com/2012/02/27/more-reasons-not-to-store-dust-in-your-dust-collector-hopper/